Weighing scale



- March 1,1927. E. G. THOMAS WEIGHING SCALE Filed Feb.2, 1924 2 Sheets-Sheet 1 [dwara 6. 7770/7706.

' 'upon'fload 'pivots l l which are fixed to the lev f 3 is a platform'spider 12 which sup- Patente d Mar. 1, 1927.

STATES PATENT OFFICE,

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' "r'o'L'nno, 01110, aooaronarron or New Jnasnr. f

WEIGHING scare.

V i p This invention relates to weighing scales,

and one of its principal objects is to improve the means employed for preventing the plat way's in' tension or compression and push 10 i and connections are eliminated.

Still another object is the provision of a' device of thi sQcharacter which may be economically ,.manu facturecl and readily as "Ysellnjbl ed in the scale and which is capable ofea'sy'iandaccurate adjustment.

"Other objects andadvantageswill be apl 'parent-"fro'm"the following description in --which reference is had to the accompanying I 'd awi 'gslllustrating preferred embodii ments of my invention and wherein similar reference numerals designate similar parts "throughout theseveral "views.

are e eknnk ttinana" Figure I'is' a front elevational view of a fsoale embo'glyingone. form of my invention, parts'beingbroken away and parts being shown in section'in order that the platform stabilizing mechanism may be clearly shown;

' FigureII is an; enlarged fragmentary elevational 5 view, partly in section, showing audits connected parts in de- 5*ntgi1re1rr is-a front elevational view of a scale embodying another form of my lnven- I 'ti'qn, pits-b ing broken away and parts being shown in section; Y

The, scale 'illus'tratedin Figure I is of the i well" known automatic fan type having a base'housing 1 upon which is'mounted an endof which is In this type of "a platform leveif"3 is 'fulcrumed on hoiising 2, the upper Qrsubstantiauy fan shape. 'sca i suitable bearings '4 within the base housing ing nehdulum in tast s-e1 5 of the lever '3 being; connected by meanest a flexible metallic ribbon 6 to the ,piower sector 7 are load-counterbalanc- '8 which is provided with an swings over a. suiticating hand 9that the fan shaped por- "able chart .10 located in I fof fthe f upright housing 2. Mounted 9 ports a commodity receiVing platform or platter 13 ;Fixedly secured to the platform through the base housing 1 and thence upwardly into the upright housing'EZ 1s a bent arm 14,1the upper end of which is provided with acone pivot 15 which has a'bearingin a socket 16 1n one end of a check link 17. The other end of the link 17 is provided with a similar socket 18 which engages a cone'pivot 19 pro- ]ectlng from an arm 20 which is pivotal-1y mounted within the upright housing 2 so that by the manipulation of adjustingscrews 21 and 22 it may be rocked to raise orv lower the pivot 19. i

The parts are so proportioned and arranged that lines connecting the pivots 1 5, 19, 4 and 11 form a parallelogram. Vhen the load pivot 11 is swung'about the fulcrum pivot 4 the pivot 15 swings about the pivot 19 to the same extent and the platform 13 is thus kept level throughout 'weighing movements of the scale. "i

In order that the pivot 15 mayalways seat firmly in the socket 16 of the link 17 :and the link be kept under'tension even though a capacity load beplaced at the extreme right side of the platform 13, a weight 23 is fixed to the bent arm l f, the mass of the weight and .its distance from the load pivot 11 being sufiicient to more than counterbalance a capacity load on the right side of. the platter 13. This weight, therefore, always holds the pivot 15 in the socket 16 and keeps the socket 18 firmly engaged with the pivot 19, regardless of the position of a load on the platter 13. i

Vhen the pivots L11, 15 and 19- arein parallelogrammatic relation. the effect of a load on the automatic load-counterbalancing 1 and maintained.

In assembling the device the link is engaged with the pivot 15 and the pivot. 19 with the ends of the arms out of alignment The arms may be then swung into the position inwhich they are shown. lVith the device assembled the link 17. cannot become disengaged from the .pivotsj15 and 19 even if a heavy weight be placed upon the right" side of the platter 13 so that the end of the arm 14 is swung into'engageinent the end of the. arm 20. V

The scale iilustrlatedia E igure III; is

before the arm 20 is secured to the housing.

erally similar to that shown in Figure I. The base housing 1 is, however, somewhat higher than the housino' 1 of the scale shown in Figure I and the platform spider 12 is provided with a downwardly extending spider stem 14 having a cone pivot 15 at its end which engages a depression in one end of a check link 17 the check link having a depression in its opposite end that is engaged b" a cone Divot 19 mounted upon an adjustable arm 20 which is pivoted within the base housing so that it may be adjusted by manipulation of adjusting screw 21 and 22.

'lhe parts are so proportioned and arranged that-lines connecting the cone pivots 15 and 19 and the fulcrum pivots P and load pivot 11 of the main lever 3 form a parallelogram. lVhen the load pivot 11 is swung about the fulcrum pivot 4 the pivot 15 swings about the pivot 19 to the same extent and the platform l3" is thus kept level throughout weighing movements of the scale. In order that the pivot 15 may always seat firmly in the depression in the end of the link l7 -and the link bekept under compression even though a capacity load be placed at the extreme right side of the platform 13?, the spider 12 is provided with a weighted arm 23 which extends to the left, the mass of the weighted arm and the distance of its center of mass from the load pivot 11 being more than suflicient to counterbalance a capacity load placed upon the right side' of the platter 13. The weighted arm, therefore, always holds the pivot 15 in the depression in one end of the link and keeps the depression in the other end of the link firmly engaged with the pivot 19. In order that the pivots 15 and 19 and the link 17 maynot become disengaged even if a very heavy load is placed upon the extreme right side of the platform 13, a stop screw 25 is mounted in the base hous ing 1 so that it may be turned to a position in which it is just out of engagement with the lower end of the stem 145. Under ordinary conditions the stem 14c remains out of engagement with the stop screw 25, but if a load greatly beyond the capacity of the scale is placed upon the right side of the platter 13, the stop screw 25 prevents the stem 14" from swinging away from the link l7 far'enough to permit the pivots 15 and 19 and the link 17 from becoming disengaged.

The embodiments of my invention herein shown and described are to be regarded as illustrative only, and it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims.

Having described my invention, I claim: 1'. In a device of the class described, in combination, a frame, a lever connected theretoby means of a fulcrum pivot, said lever having a load pivot, a commodity-receiver located above said load pivot and positioned substantially symmetrically in respect thereto, an arm extending from said commodity-receiver, a link pivotally connecting said arm and said frame, the axes of the pivotal connections between said link, the arm and frame and the load and it'ulcrum pivots of said lever being in parallelogrammatic relation, and means for keeping said link in tension regardless of the position on the platform of a load within the capacity of the scale.

2. In a device of the class described, in combination, a frame, a lever connected thereto by means of a fulcrum pivot, said lever having a load pivot, a commodity-receiver located above said load pivot and positioned substantially symmetrically in respect thereto, an arm extending from said commodity-receiver, a link pivotally connecting said arm and said frame, the axes of the pivotal connections between said link,

the arm and frame and the load and fulcrum pivots of said lever being in parallelogrammatic relation, and a weight fixed to said arm and tending to swing said commodityreceiver about said load pivot in a direction' to keep said link in tension.

3. In a device of the class described, in combination, a frame, a lever connected thereto by means of a fulcrum pivot, said lever having a load pivot, a eommodity'receiver located above said load pivot and positioned substantially symmetrically in respect thereto, an arm extending from said commodity-receiver, a link pivotally connecting said arm and said frame, the axes of the pivotal connections between said link, the arm and frame and the load and fulcrum pivots of said lever being in parallelogrammatic relation, and means for keeping said link under stress in one direction regardless of the position on the platform of a load within the capacity of the scale.

4. In a device of the class described, in combination, a frame, a lever connected thereto by means of a fulcrum pivot, said lever having a load pivot, a commodity-receiver located above said lead pivot and positioned substantially symmetrically in respect thereto, an arm extending from said commodity-receiver, a link pivotally connecting said arm and said frame, the axes of the pivotal connections between said link, the arm and frame and, the load and fulcrum pivots of said lever being in parallelogrammatic relation, and a weight fixed to saidarm and tending to swing said commodityreceiver about said lead pivot in a direction to keep said link under'stress in one direction.

5. In a device of the class described, in:

thereon, a c0mmodity-receiver pivoted on said lever, an armeextending laterally and upwardly from said commodity-receiver, a

positioned as to keep said link in tension.

6; In a device of the class described, in combination, a base housing, a lever supported therein, an upright housing supported on said base housing, a commodityreceiver supported on said lever, an arm extending from said commodity-receiver laterally in said base houslng and thence upwarda Weight fixed on .said arm and positioned I to keep said link intension.

7 In a device of the class described, in

a link connect combination, a commodity-receiver, an arm extending therefrom, said arm having a cone pivot projecting laterally therefrom, a frame, a laterally projecting cone pivot thereon, said cone pivots projecting in opposite directions, and a link having sockets adapted to engage said cone pivots.

8. In a device of the class described, in combination, a U-shaped link having an inwardly opening socket in each of its arms, a pair of relatively movable members having laterally projecting cone pivots engaging said sockets, and abutment means on said members adapted to prevent said members from moving toward each other sufiiciently to withdraw said cone pivots from said sockets.

EDWARD G. THOMAS. 

